The RE Context Libraries module is the latest 'official' module released by Raised Eyebrow. This is a small module that builds upon the excellent Context module and has promises to be a real timesaver when theming new Drupal websites.
The Context module's great advantage over Drupal's native Blocks module is that it dramatically expands the set of conditions that can be used to determine where blocks can be displayed. This enables us to build Drupal sites where the behaviour of blocks is quite sophisticated--for example, we might decide to display a block containing a list of upcoming events on event nodes or on nodes with a certain taxonomy term. On a stock Drupal site, this would require custom coding.